Paper-bag machine.



Patented Nov. l4, I899.

E.,E. CLAUSSEN.

PAPER BAG MACHINE.

(Application flladJuna 9, 1899.)

8 Sheets Sheet L (No Model.)

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No. 636,760. i Patented Nov. 14,1899;

1 E. E. CLAUSSEN.

PAPER BAG MACHINE.

(Application filed Juno 9, 1899.) v (No'ModaL) 8 Sheets-Sheet 2.

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No. 636,760. 7 Patented Nov. l4, I899.

E. E. CLAUSSEN.

PAPER BAG MACHINE.

(Application filed June 9, 1899.) 4N0 Model.) '8 SheetsSheet 3,

1 i in asses.

y/mmaf Patented Nov. l4, I899.

E. E. CLAUSSEN. PAPER BAG MACHINE.

(Application filed June 9, 1899.)

(No Model.)

8 Sheets-Sheet 4.

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Patented Nov. I4, I899.

E. E. CLAUSSEN.

PAPER BAG MACHINE.

(Application filed June 9, 1899.)

8 Sheets-Sheet 5 -(.No Model.)

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No. 636,760. Patented Nov. I4, I899. E. E. CLAUSSEN. PAPER BAG MACHINE.

(Application filed June 9, 1899.) (N M 8 Sheets-Sheet s,

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Patented Nov. 14, I899.

E. E. CLAUSSEN.

PAPER BAG MACHINE.

(Appliation filed Juno 9, 1899.)

(No Model.)

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Patented Nov. I4, I899.

E. E. cLAussEN; PAPER BAG momma.

(Application flied June 9, 1899.)

8 Sheets-Sheet a,

6N0 Model.)

mi Zncsses: %Q 6 UNITED STATES PATENT FFICE.

PAPER-BAG MACHINE.

'sPEcIFIcATIoN formingpart of Letters Patent No. 636,760, dated November14, 1899.

Application filed June 9,1899. Serial No. 719,910. (No model.)

To all whom it may concern:

Be it known that I, EDWARD E. CLAUSSEN, a citizen of the United States,residing at Hartford, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inPaper-Bag Machines, of which the following is a full, clear, and exactspecification.

This invention relates to improved means for converting tu cked-papertubes into squarebottomed paper bags. The tubes which are to be foldedinto bags may be made and fed into the machine in any of several waysnow well known in making paper bags, and the mechanisms which form thesubject of this invention may be employed in connection with varioustypes of paper-bag machines, and the same are equally applicable to andadapted as a converter for bags made in accordance with Letters Patentgranted to L. O. Crowell February 20, 1872, No. 123,811, and known incommerce as the square bag, to convert the same into the square-bottomedbag.

One object of myinvention is to provide a simple, rapid, and reliablemachine to complete by a single operation the bottom of the bag.

Another object of my invention is to provide suitable means for drawingthe tube into the machine at a uniform speed, and, when the same hasbeen fed forward the proper amount, to provide mechanism for retardingthe leading end thereof, and thereby produce a slack between thedrawing-rolls and the gripping-rolls, whereby a better severing of thebag-blank from the tube is accomplished, and simultaneously theretardation of the bag-bottom end of the blank allows more time for thebottom-forming mechanisms to perform the folding operation on thebag-bottom, whereby a greater speed in the manufacture of paper bags isattained- Still another object of my invention is to provide abottom-folding mechanism consisting of a folding-plate and apresser-plate, the same being arranged crosswise of the machine and oneabove the other, so that as the blank emerges from the gripping-rolls itpasses be tween the same for the formation of the bagbottom. Thus thefolding plate and the presser-plate are superimposed one above theother, with the tube between them, while the axes of their bearings areat right angles to the tube. These two axes are substantially coincidentwith each other and are located substantially at that position where thecharacteristic primary transverse fold is to be made in the bag-blank.The bearing of the folding-plate is arranged in the right-hand side ofthe machine, whereas the bearings for the presser-plate are arranged onthe lefthand side, and these plates are each provided with suitablebevel-edged grippers, which are adapted to hold the plies of the tube ofthe blank against the inner sides of these plates, and the beveled innerends of these grippers serve as formers for defining the characteristicright-angled triangular folds which are to be formed in thebellows-sided blank. Mechanisms are also provided for operating thebeveledged grippers and the forming-plates and their respectivebevel-edged clips in proper time with each other, controlled by suitablecams to cooperate with the other mechanisms of the machine, as will bemore fully described hereinafter.

In the preferred embodiment of this invention, herein shown anddescribed, the paperbag machine comprises in part a suitable bed orframework, drawing-roll mechanisms for drawing the tucked-paper tubeinto the machine at a uniform speed, a revolving striker rotating acrossthe path of the tube, verticaily reciprocating gripping rolls revolvingat a retarded and an accelerated speed, bottom-forming mechanismsembodying the folding-plate, and the presser-plate provided with meansfor effectively holding the lower ply of the tube to the upper side ofthe folding-plate, and also with nipper mechanism for holding the upperply of the paper tube to the lower surface of the presser-plate, anoscillating tucker-blade cooperating with the folding-plate and thepresser-plate, a liftingplate mounted on the presser plate, and meansfor delivering the completed bag, all substantially as hereinafterdescribed, and more particularly set forth in the claims.

In the drawings accompanying and forming a part of this specification,Figure l represents the plan of the machine. Fig. 2 represents a sideelevation of what is shown in Fig. 1, showing the paper-roll from whichthe paper is taken, converting the same into the tube, and drawing thesame into the machine to have the bottom completed thereon. Fig. 3 isa'plan view, drawn in an enlarged scale, showing the tube in thatposition in which the striker is about to sever the bag-blank from thetube and the bottom-folding mechanism to operate thereon to effect thefolding of the bag-bottom. Fig. 4 is a side view of what is shown inFig. 3, representing the geueral construction and arrangement of thegearing which drives and operates the various mechanisms. Fig. 5 is aside elevation of what is shown in Fig. 3, taken on the broken line 5 5of that figure and in the direction of the arrows. Fig. 6 is across-sectional end view taken on the line 6 6 of Fig. 4 and in thedirection of the arrows. Fig. 7 is a sectional end view taken on thezigzag line 7 7 of Fig. 4, lookingfrom the rear to the front end of themachine. Figs. 8, 9, and 10 are respectively fractional plan, front, andside views showing the peculiar arrangement of the folding-plate and itsbevel-edged side clips carried thereby. Figs. 11, 12, and 13 arerespectively fractional plan, front, and side views of the presser-platemechanism and its cooperating bevel-edged side nippers. Figs. 14, 15,16, and 17 show various successive positions of the bag-blank during theformation of the folding of the bag-bottom, and the mechanisms wherebythe unfolding ofthe blank and the subsequent refolding into thesquare-bottomed bag is accomplished.

The letters and numerals herein used indicate, respectively, the sameparts in the different figures of the drawings.

The arrows indicate, without further description, the direction ofmovement of parts.

In the accompanying drawings the position of the variousinstrumentalities is shown to best advantage, irrespective of therelative position these parts may have to their respective cam-grooves,and the same is true of all parts hereinafter mentioned, it beingconsidered sufficient for the purpose of this description to assume thatthe cams are properly out to effect the various operations required atthe proper time and to the necessary extent.

For more clearness the gears 32, 33, 64, and are broken away; but theyare to be understood as having teeth out around their fullcircumferences.

A description will first be given of the general construction andarrangement of each section and of each motion of the machine andafterward their combined mode of operation will be described.

The base 20, adapted to receive the various brackets and the frameworkof the machine, is also adapted to properly support the paperroll 21,from which the paper is drawn, passed overthe roll (1, around theformer, and converted into the tube 22, as clearly shown in Figs. 1 and2.

Power is communicated to the machine by the pulley 23 in the directionof the arrow 24, which is fastened on shaft 25 on the outside of theframe 27, and that shaft is journaled in the frames 27 and 28 andcarries on the outside of the frame 28 the hand-wheel 26, and from thisshaft the various gears communicate motion to the different parts of themachine. The shaft 25 has rigidly affixed thereto the gear 29, meshinginto the gear 30, which is loosely mounted upon the shaft 31 and engagesthe gear 32. The gear 32 is rigidly connected with the gear 33, looselyjournaled on the stud 33 and meshing into the gear 34, and that gearengages the gear 35. The gear29 also meshes into the gear 36, whichengages the gear 37 ,which again meshes into the gear 38. The gear 30meshes also into the gear 39, which engages the gear 39, which againmeshes into the gear 40, and whereby a complete train of gearing isestablished, all of which is driven at a uniform circumferential speed.The gears 34 and 35 are respectively mounted on the shafts 41 and 42,journaled in the frames 27 and 28, and these shafts carry, respectively,the drawing-rolls 43 and 44,havin g theircentral portion grooved, so asto permit the float 45, terminating in the serrated edge 46, to passbetween them and whereby the paper tube is drawn into the machine at auniform rate of speed. Above the float and mounted crosswise of the tubeis the serrated lip-knife 47, securely held on lugs projecting from theframes 27 and 28, against which the tube is forced when separating theblank therefrom, as will now be described. Securely fastened on theshaft 31 and adjacent to the frame 27 is the spiral gear 48, meshinginto a corresponding spiral gear 49, which is securely fastened on thestriker-shaft 50, journaled lengthwise of the machine in bearings 51 and52, projecting from the inner side of the frame 27. Rigidly affixed tothe striker-shaft 50 is the strikerarm 53, whereby the tube is severedas the arm is rotated across the path of the tube against the serratedfloat 45 and lip-knife 47.

As a convenient means forimpartinga variable circumferential speed tothe grippingrolls 61 and 66 and also an oscillatory motion up and down Ihave devised the mechanism which will now be described and best shown inFigs. 4 and 6. The gear 30 is loosely journaled on the shaft 31 and isprovided with a hub 54, from which the arm 55 extends, which supportsand pivotally carries the sector 56, meshing into the pinion 57, cutinto the shaft 31. The laterally-projecting arm of the sector 56 isprovided with a projection 58, which engages the groove 59 of thestationary cam 60, rigidly held on the inner side of the frame 28. Asthe gear 30 is caused to be revolved at a uniform speed the arm 55revolves therewith, carrying along the sector 56 and giving a variablespeed to the shaft 31. Securely held upon the shaft 31 is the lowergripping-roll 61, provided on each side thereof with the circularflanges 62 and 63, the object of which will be described later. Adjacentto the flange 62 is the gear 64, meshing into the gear 65, held securelyfastened to the upper gripping-roll 66 and whereby the variable speedimparted to the shaft 31 and roll 61 is communicated to the roll 66. Oneach {side of the roll 66 are mounted the cam-plates 67 and 68, adaptedto engage and cooperate with the circular flanges 62 and 63 of the lowergripping-roll 61. The upper gripping-roll 66 is rigidly mounted on theshaft 69, journaled in the boxes 70 and 71, which are adapted to slidevertically in their respective frames 27 and 28. Springs 72 and 73 tendto press theroll 66 into operative engagement with the roll 61 during apartial rotation thereof, the same being timed and regulated by theshape of the cam-plates 67 and 68, engaging the circular flanges 62 and63.

The gear 30 meshes into the gear 39, which engages the gear 39, whichagain engages the gear 40 and whereby a uniform rotary motion istransferred to the pasting mechanism, which will now be described.

The gears 39 and 40 are respectively mounted on shafts 75 and 76, whichare placed one behind the other crosswise of the machine and journaledin the frames 27 and 28. The shaft 75 rigidlysupports the paster 77,which receives its paste from the paster-roll 78, which revolves in thepaste-box 79, rigidly supported on the rod 80, which is also mountedcrosswise of the machine and is supported in the frames 27 and 28.

The mechanisms which convert the bottomforming end of the tube into thesquare-bottomed paper bag will now be described.

Mounted crosswise of the machine and j ournaled in the frames 27 and 28,below the shaft 25, is the tucker-blade shaft 81, which has securelyfastened thereto, projecting upward on each side of the lowergripping-roll 61, the arms 82 and 83, which support on their uppersurface the tucker-blade 84, which is placed immediately above the papertube emerging from the gripper-rolls 61 and 66. On the outside of theframe 27 the shaft 81 has securely fastened thereto the cam-arm 85,provided with the projection 86, engaging a groove in the cam 87 andwhereby the tucker-blade 84 is oscillated from the position shown inFigs. 5 and 14 through the stages of forming the bottom, as shown inFigs. 15, 16, and 17. The bottom-folding mechanism also consists of thefolding-plate 88, which is securely fastened on the head 89, forming apart of the shaft 90, which has its bearing in the projecting lug 91,extending inwardly from the frame 28. On the outside of the frame 28 theshaft 90 has rigidly secured thereto the sector-pinion 92, engaging thesegment 93, which is loosely supported on the shaft 94, extendingcrosswise of the machine and j ournaled in the frames 27 and 28. Thedownward-projecting arm of the segment 93 is provided with theprojection 96, engaging a groove in the cam 97, and whereby thefolding-plate 88 is adapted for an oscillatory motion through the arc ofa circle of about one hundred and eighty degrees, as clearly shown inFigs. 14 to 17. The folding-plate 88 is provided on each side withdownwardly-projecting arms 100, which are adapted to receive thebevel-edged side clips and their operating mechanisms. The constructionand operation of the side clips being substantially the same on eachside of the folding-plate, I have designated these parts with the samenumerals, which are as follows:

The side clips 101 are pivoted to the arms by the pivots 102 and carryon their outer ends the arms 103, engaging spirally cut grooves in thecams 1041, supported and rigidly held on the shaft 105, which is alsojournaled in the arms 100. The spirallycut grooves in the cams are cut,respectively, right and left handed, so that when the shaft 105 isturned in one direction they will simultaneously close both side clipsand will open them when the shaft is caused to be turned in the oppositedirection. The location of these side clips is substantially such thatthe line passing through the intersecting points of the bevel-edged sideclips and the edges of the tube forms eventually the edge of thecompleted bag-bottom. On the righthand side of and adjacent to thespirally-cut cam 104 is the pinion 106, which is engaged by the sector107, loosely journaled on the shaft 90. On the hub of the sector 107 isarranged the pinion 108, which is engaged by the sector 109, which isloosely pivoted for oscillation on the shaft 94, and has adownwardly-projecting arm 110, provided with the projection 111 engagingin the cam 112. By the means just described the side clips 101 arecaused to be oscillated inwardly toward each other at predeterminedtimes to grip the paper tube and hold it on the upper side of thefolding-plate and are also effectively carried outward to release theblank when the bag is completed. The folding-plate 88 is also providedon each side of the tube with two upwardly-projecting studs 113, thepurpose of which I will describe more fully later on.

Mounted above the folding-plate 88 and superimposed above the tube isthe presserplate 116, which is fastened to a head 117, forming a part ofthe shaft 118, which is mounted for vibratory motion in theinwardlyprojecting bearing 119 of the frame 27, and that shaft isprovided on its outer end with a sector-pinion 120, meshing into thesector 121, which is loosely mounted on the shaft 9 1 and has integraltherewith a downwardlyprojecting arm 122, provided with a projection123, engaging the groove on the inner side of the cam 87, and wherebythe presserplate 116 is adapted to receive an oscillatory motion, forthe purpose described hereinafter. The location of the center lines ofthe shafts 90 and 118 of the folding-plate 88 and the presser-plate 116,respectively, is substantially such that they coincide with one anotherand also correspond with the folding edge 140 of the lifting-plate 140.

The presser-plate 116 is provided with gripping mechanisms, which aresubstantially alike on each side thereof, and for the sake ofconvenience I have given those parts the same characters. On the uppersurface of the presser-plate 116 and projecting upward are the arms 124,which carry pivotally-mounted side nippers 125, pivoted on shafts 126,which receive 011 their outer ends the cam-arms 127, engagingspirally-cut grooves of the cams 128, securely fastened on the shaft129. The spirally-cut grooves in the cams 128 are respectively right andleft hand, so that when they are turned in one or the other directionthe side nippers are simultaneously opened or closed. The location ofthe side nippers is such that the line passing through the intersectingpoints of the bevel-edged side nippers and the edges of the paper tubeforms eventually the rear edge of the completed bag. 0n the outerleft-hand end of the shaft 129 is fastened the pinion 130, as clearlyshown in Figs. 7, 11, 12, and 13, and that pinion meshes into the sector131, which is pivoted on the shaft 118, and has cut on its hub thepinion 132, which engages the sector 133, loosely journaled on the shaft94, integral with and carrying the downward-projecting arm 134, providedwith the projection 135, engaging a groove 136 of the cam 137. By themeans just described the side nippers 125 are adapted to swing inwardlyagainst the under side of the presser-plate 116 at proper times and tothe required extent. In the arms 124 of the presser-plate 116 isjournaled the lift ing-plate 140, provided with the folding edge 140 onthe shaft 141, which is held springpressed downward in its normalposition by the spring 142, coiled around the shaft 141, and when thepresser-plate and the foldingplate are in the position as shown in Figs.1 and 14 the stud 113 on the plate 88 presses the lifting-plate out ofits normal position to permit the advancing end of the blank to passbetween them, and as soon as those plates begin to separate, as shown inFig. 15, the spring 142 presses the lifting-plate down, so that thefolding edge 140 engages the folding-plate, as shown in that figure. Asstated above, the folding edge 140 coincides with the centers of the twooppositely-disposed shafts 90 and 118, that form the centers ofoscillation of the folding-plate 88 and the presser-plate 116, and it isfurthermore observed that the distance from the edge 140 to theintersection of the bevel-edged side clips and bevel-edged side nipperswith the edges of the paper tube is equal to the depth of the tucks ofthe bag-blank.

The gears 37 and 38 are securely fastened on the shafts 143 and 144,mounted crosswise to the machine and journaled in the frames 27 and 28,and carry the delivery-rolls 145 and 146, and as the bag is completedthe tucker-blade 84 delivers the completed bag' from the bottom-formingmechanism into the bite of the delivery-rolls.

An important feature of this invention is the arrangement andconstruction of and the manner in which the folding and the presserplates are mounted. The centers coinciding and also being in alinementwith the folding edge 140 will always bring the secondary trans versefolding-line in the bag which is defined by the edge 140 in the exactposition. This is very desirable, inasmuch as those folds, if made on aline not coincident with the axis of oscillation of their foldingdevices, are liable to be more or less distorted and irregular.

I have preferably arranged the grip ping-roll 66 with the projection 66running crosswise to the roll, upon which the paster 77 deposits thepaste and from which it is transferred to the bag-blank. Thecross-groove 61, cut in the lower gripping-roll 61, serves as aclearance to prevent paste being deposited upon the roll should themachine fail to present a bag-blank, which occurs every time a new rollof paper is threaded into the machine.

The operation of the machine is as follows: The paper roll 21 havingbeen properly placed in its journals and having supplied the twopaste-boxes with paste, the paper is guided backward and upward aroundthe roll a and properly threaded around the former I 22, which forms thetube in the well-known manner. The bellows-sided tube, which surroundsthe former and float, is drawn from the former, which terminates in theserrated float 46, as shown in Fig. 1, by means of the drawing-rolls 43and 44 passing beneath the serrated lip-knife 47. The drawing-rolls areso geared in relation to the revolution of the striker as to feedthrough a suitable length of tubing for each revolution, and thegrippingrolls are caused to be pressed against one another by means ofthe springs 72 and 73 and by virtue of the circular flanges 62 and 63and the cam-plates 67 and 68, and at this instant the retarding motionof the gripper-rolls takes place by means of the cam-groove 59 of thecam 60, thereby forming a slack in the tube to facilitate the cuttingoff of the blank, as clearly shown in Fig. 5. Immediately after theblank is severed from the tube an accelerated motion is imparted to thegrippingrolls, thereby compensating for the previous retardation ofthose rolls. As the bottomforming end of the tube passes between thegripping rolls the same are separated by means of their cam-plates 67and 68, and paste is applied from the paste-box 79 and its roll 78 tothe paster 77, then upon the projection 66, and from there upon thebag-blank, forming a transverse paste-line. As the bottomforming end ofthe bag-blank emerges from the gripping-rolls the same passes betweenthe presser-plate and the folding-plate, the lifting-plate being heldout of its normal position by engaging the upward-projecting studs 113of the folding-plate 88. When the blank arrives at the position as shownin Fig. 14, the bevel-edged side clips 101 and the bevel-edged sidenippers 125 close into the tucks of the tube and hold the lower plies tothe folding-plate 88 and the presser-plate 116. At this instant theretardation of the grippingrolls takes place, whereby time is allowedfor the accurate and close gripping of the tube, and an increased speedof the machine is attained. Meanwhile the folding-plate 88 and thepresser-plate 116 are caused to be oscillated, and simultaneously thetucker-blade 84 proceeds in the direction of the folding-plates, and thebag is gradually transformed, as shown in the position of Fig. 15, untilit reaches the position of Fig. 16, at which point the presser-plate hasits movement reversed to its starting position, whereas the foldingplate88 continues on with its motion until it reaches the position of Fig.17. The side clips and side nippers are then withdrawn, leaving thefolded bag resting on the tuckerblade 84, which delivers it into thebite of the delivery-rolls 14:5 and M6.

Having thus fullydescribed my invention, I claim- 1. The combination ofa pair of drawingrolls to draw a paper tube at a uniform speed, a pairof gripping-rolls, the cam 60, the shaft 31, and intermediate mechanismwhereby the circumferential speed of the gripping-rolls is adapted to beretarded to form a slack in that tube, and also adapted to beaccelerated to compensate for the slack formed in the tube caused by theretardation of the same, and the striker to sever the tube,substantially as described.

2. The combination of a pair of drawingrolls to draw a paper tube at auniform speed, a pair of gripping-rolls, the cam 60, the shaft 31, andintermediate mechanism whereby the circumferential speed of thegripping-rolls is adapted to be retarded to form a slack in that tubeand also adapted to be accelerated to compensate for the slack formed inthe tube caused by the retardation of the same, the float 45 surroundedby the tube and the lipknife 47 mounted above the tube, and the strikerto sever the tube, substantially as described.

3. The combination of a pair of drawingrolls adapted to draw the papertube into the machine at a uniform speed, a pair of gripping-rollsmounted in substantial parallelism with the drawing-rolls, means formoving the gripping-rolls away from and toward each other to alternatelygrip and release the bagblank, and means for varying the circumferentialspeed of the gripping-rolls during the time the bag-blank is held in thebite of those rolls, substantially as described.

4:. The combination of a pair of drawingrolls adapted to draw the papertube into the machine at a uniform speed, a pair of gripping-rolls,cam-plates mounted on the shafts of the gripping-rolls and whereby thegripping-rolls are moved away from and toward each other, devicessubstantially as described for decreasing and increasing thecircumferential speed of the gripping-rolls to form a slack in the tube,and devices to grip the bottom-forming end during the time theretardation of the tube takes place, substantially as described.

5. In a paper-bag machine, the combination of a pair of gripping-rolls,devices for retarding the circumferential speed of those gripping-rollsand thereby retarding the forward movement of the paper blank, andbottomfolding mechanisms to grip and complete the bellows-foldedsquare-bottom bag by a single operation during the retardation of thebagblank, substantially as described.

6. The combination of the folding-plate, means for vibrating the sameabout one hundred and eighty degrees, side clips adapted to close uponthe upper surface of the foldingplate, the presser-plate, means forvibrating the presser-plate, side nippers adapted to be closed upon thelower surface of the presserplate,the lifting-plate mounted on thepresserplate and provided with the folding edge, and the tucker-blade,all combined and operating substantially as set forth.

7. The combination of a folding plate, means for vibratin g the same,side clips adapted to close upon the upper surface of the folding-plate, the presser-plate, means for vibrating the presser-plate, sideclips adapted to close upon the lower surface of the presserplate, thefolding-plate and the presser-plate mounted so that the center ofvibration of the folding-plate and the center of vibration of thepresser-plate coincide with one another, side nippers adapted to closeupon the lower surface of the presser-plate, the lifting-plate mountedon the presser-plate, and the tuckerplate, all combined and operatingsubstantially as described.

8. The combination of a folding plate, means for vibrating the same,side clips adapted to close upon the upper surface of the folding-plate,the presser-plate, means for vibrating the presser-plate, side nippersadapted to close upon the lower surface of the presserplate,thelifting-plate mounted on the presserplate and provided with a foldingedge, the folding-plate, the presser-plate and the lifting-plate mountedsubstantially so that the centers of vibration of the folding-plate andthe presser-plate coincide with one another and also coincide with thefolding edge of the lifting-plate, and the tucker-plate, all combinedand operating substantially as set forth.

9. In apaper-bag machine, the combination of afolding-plate journaled onone side of the paper blank, means for vibrating the foldingplate, sideclips adapted to close upon the upper surface of the folding-plate, thepresserplate mounted on the other side of the paper blank, means forvibrating the presser-plate, the folding-plate and presser-plate mountedin substantially such a position that the centers of vibration coincidewith one another,

side nippers adapted to close upon the lower surface of thepresser-plate, the lifting-plate mounted on the presser-plate andprovided with the folding edge, which is coincident with the linepassing through thereenters of vibration of the folding-plate and thepresserplate, and the tucker-plate, substantially as described.

10. In a machine of the class specified, the combination of thefolding-plate supported on one side of the blank, means for vibratingthe folding-plate, side clips supported on either side of the blank andadapted to close upon the upper surface of the folding-plate; thepresser-plate supported on the otherside of the blank and adapted tooscillate upon an axis located substantially coincident with the centerof vibration of the folding-plate, side nippers supported on either sideof the presserplate and adapted to close upon the lower surface of thepresser-plate, the lifting-plate mounted on the presser-plate, providedwith the folding edge which is substantially in line with the center ofvibration of the presserplate and the folding-plate, and thetuckerblade, all combined and operating substantially as set forth.

11. Inapaper-bagmachine,incombination, the folding mechanism, consistingof the folding-plate and the presser-plate disposed on the opposite flatsides of the blank and supported in stationary frames at each edgethereof, the folding-plate and the presser-plate adapted to be vibrated,the centers of vibration being substantially coincident with each other,side clips mounted on the folding-plate, side nippers mounted on thepresser-plate, the lifting-plate mounted on the presser-plate and havinga folding edge coincident with the center of vibration of the foldingand presser plate, the tucker-plate to form the transverse fold in theblank, all combined and operating as set forth.

12. In a paper-bag machine, the combination of the gripping-rolls, meansfor rotating the same with a retarded and an accelerated speed, foldingmechanism consisting of the folding-plate, supported on one side of theblank, and also provided with means for vibrating the same upon an axislocated substantially in line with the secondary transverse folding-linewhich is to be folded in the bag-blank, side clips adapted to close uponthe upper surface of the folding-plate, the presser-plate supported onthe other side of the blank and adapted to oscillate upon an axislocated substantially coincident With the center of vibration of thefolding-plate, side nippers adapted to close upon the lower surface ofthe presser-plate, the lifting-plate mounted on the presser-plate,provided with the folding edge, which is substantially in line with thecenter of vibration of the presserplate and the folding-plate, and thetuckerblade, all combined and operating during the time the retardationof those gripping-rolls takes place, substantially as set forth.

13. In a'paper-bag machine, the combination of the gripping-rolls, meansfor rotating the same with a retarded and an accelerated circumferentialspeed, a folding mechanism consisting of the folding-plate and thepresserplate disposed on the opposite flat sides of the blank, andsupported in stationary frames at each edge thereof, the folding-plateand the presser-plate adapted to be vibrated, the centers of vibrationbeing substantially coincident with each other, side clips mounted onthe folding-plate, side nippers mounted on the presser-plate, thelifting-plate mounted on the presser-plate and havingafolding edgecoincident with the centers of vibration of the folding and presserplate, the tucker-plate to form the transverse fold in the blank, allcombined and operating during the time the retardation of thosegripping-rolls takes place, substantially as set forth.

14. The combination of the folding-plate,

means for vibrating the same about one hundred and eighty degrees, sideclips adapted to close upon the top surface of the foldingplate, thepresser-plate, means for vibrating the presser-plate, side nippersadapted to be closed upon the lower surface of the presserplate,thelifting-plate mounted on the presserplate and providedwith the foldingedge, the tucker-blade, studs 113 secured on the folding-plate adaptedto engage the lifting-plate to permit the end of the bag-blank to enterthe folding mechanisms, substantially as described.

- 15. The combination of a folding-plate, means for vibrating thesame,side clips adapted to close upon the upper surface of thefolding-plate, the presser-plate, means for vibrating the presser-plate,the lifting-plate mounted on the presser-plate and provided with afolding edge, the folding-plate, the presserplate and the lifting-platemounted substantially so that the centers of vibration of thefolding-plate and the presser-plate coincide with one another, and alsocoincide with the folding edge of the lifting-plate, side nippersmounted on the presser-plate and adapted to close upon the lower surfaceof the presserplate, the tucker-plate, studs 113 secured on thefolding-plate adapted to engage and raise the lifting-plate out of itsnormal position during the time the advancing end of the bagblank entersthe folding mechanisms, substantially as described.

EDXVARD E. CLAUSSEN.

Witnesses:

H. D. MILDEBERGER, J. S. ELLSVVORTH.

